Switching Facilities in MPEG-2: Necessary But Not Sufficient

S. Merrill Weiss, consultant

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Content Summary

MPEG-2 provides hooks for "switching", i.e. realtime interpolation of different source content into a media stream, but the hooks provided are insufficient for the commercial requirements of cable and TV, especially compared to current analog systems. Problems include:

The author proposes standardized data and packet rates (integral multiples of things), standardized program element lengths (doesnąt TV already have this?), standardized entry points for streams with guaranteed bounds on buffer conditions at those points, and building transitions into pre-encoded material (yeah, right).

Relevance to Multimedia

MPEG-2 is the anointed HDTV format, and although it provides the mechanism for doing stream switching, it lacks sorely needed policy to make switching really feasible.


2 out of 5: A good point, but this paper should have been no more than 5 pages long.
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